Blank for flexible bolts.



E. l. DODDS.

BLANK FOR FLEXIBLE BOLTS.

4 APPLICATION FILED SEPT. 14' 1915- 1,20 ,949; Patented Dec. 26,1916.

Attorney fi/JZZZ WITNESSES nivirnn spares 'rarnnr @FFIQE.

ETHAN I. DODDS, 0F PITTSBURGH, PENNSYLVANIA, ASSIGNOR TO FLANNERY BOLT COMPANY, 0F PITTSBURGH, PENNSYLVANIA.

BLANK FOR FLEXIBLE BOLTS.

Specification of Letters Patent.

Patented Dec. 26, 1916.

Original application filed June 15, 1915, Serial No. 34,264. Divided and this application filed September To all whom it may concern:

Be it known that'I, ETHAN I. Donns, a citizen of the United States, and a resident of Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Blanks for Flexible Bolts; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to an improvement in blanks for flexible bolts, and is a division of application Serial Number 34,264; filed by me June 15th, 1915.

This invention consists in a bar for bolt blanks composed of two semi-cylindrical members connected at one edge, one member having a longitudinal rib resting within a groove in the adjacent face of the other member, thus producing a bar for bolt blanks, which will be free to give or yield under longitudinal and torsional stresses but which will have approximately the same tensile capacity as a solid bar.

In the accompanying drawings, Figure 1 is a view of a bar after its preliminary rolling; Fig. 2 is a view in section of said bar after it has been folded onto itself and rolled into cylindrical shape, and Figs. 3 to 10 inclusive are views of modified forms.

In carrying out my method I take a slab or bar of steel or iron and pass it while heated, between rolls shaped to convert the slab or bar into two semi-cylindrical connected members 11 and 12, each of which has a groove 13 and a rib 14, on its inner or contacting face, the said grooves and ribs being so located, that when the two members are folded together by rolling, the rib of each section rests within-the groove of the other section as shown in Fig. 2. The cross section of this bar is circular with an -shaped substantially closed slot formed by the ribs and grooves, the slot being closed at one edge. After the bar has been shaped as shown in Fig. 1, it is passed between rolls and rolled into cylindrical shape as in Fig. 2, without welding the two contacting faces, thus forming a cylindrical bar composed or two members united at one edge only. After the bar has been thus formed, it may be twisted longitudinally from end to end so that the exposed edge of the slot will be in Serial No. 50,663.

the form of a spiral extending from one end of the bar to the other. To make bolts from the bar, the latter is reheated and is fed to a machine which upsets the head and cuts off the blank. By twisting the bar from which the bolt blanks are cut, the twist will be constant and uniform from end to end and consequently uniform in the blanks that are cut from the bar. The upsetting of the heads welds the walls of the slot at the heads, but leaves the contacting walls of the slot in the shanks of the bolts disconnected, thus permitting the shanks to give or yield under longitudinally and torsional stresses. After the blanks have been cut from the bar, the threads are then either hot or cold rolled or they may be cut.

Figs. 3 and 5 represent bars or slabs after the preliminary rolling, each member 11 and 12 having a rib and a groove as in the previous construction, and Figs. 4: and 6 show these forms after they have been folded and rolled into cylindrical shape.

In Figs. 1 and 2 the grooves and ribs have curved faces, whereas in Figs. 3 to 6 inclusive the grooves 13 and ribs 14: are angular.

In the construction shown in Figs. 7 and 8, one member 11 of the slab or bar is rovided with a centrally located longitudlnal rib 14: and the other member 12 is provided with a similarly shaped groove 13 to receive the rib when the two members are rolled into cylindrical shape as in Fig. 8.

The construction shown in Figs. 9 and 10 is the same as that shown in Figs. 7 and 8 except that the rib and groove are angular instead of curved.

The forms shown in Figs. 7 and 10 are particularly adapted for boiler stay bolt construction, as they leave the center of the bar solid and intact for the telltale holes or bores which are always located centrally in the bolt head.

It is quite evident that the shapes of the grooves and ribs may be modified without departing from the spirit of the invention; hence I would have it understood that I do not confine myself to the details of their features except as defined in the appended claims.

Having fully described my invention what I claim as new and desire to secure by Letters-Patent, is

1. A bar from which bolt blanks are cut,

connected at one edge, one member having a longitudinal rib resting within a groove 1n the adjacent face of the other member.

2. A bar from which bolt blanks are out composed of two members connected at one edge, one member having a longitudinal rib resting within a groove in the adjacent face of the other member.

8. A bar from which bolt blanks are out composed of two members connected at one edge, each member having a longitudinal rib resting within a. groove in the adjacent ETHAN I1 DODDS.

lVitnesses:

F. H. ALLISON, EDWIN S. RYoE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of latents, Washington, D. G. 

